Developer Notes

This issue has been closed as 'Won't Fix' due to an extended period of time without updates. If this issue is important to you please let us know by posting on the AnswerHub or UDN, and Epic will re-open the ticket for further review.


A licensee is trying to use Distribution Float Particle Parameters for the Noise properties of a Beam Particle. When trying to change these parameters in a Blueprint, some work, others don't.

When ejecting to Simulate mode and checking the details of the Particle System, the blueprint is changing the parameter values, but the changes aren't reflected in the visuals.

*Sample map & screen shots attached. Repro steps below

Steps to Reproduce

1. Open attached project file.
2. Open NewMap. A BP with Particle System is in the map. (Attached screenshots show particle settings and use of Distribution Float Particle Parameters)
3. Play the map and use the following keys to change parameters
-1 key = change curve to smooth
-2 key = change curve to sharp points
-3 key = Make vertical range of noise smaller
-4 key = Make vertical range of noise bigger

*Keys 3 & 4 change the parameter and the vertical height of the noise changes accordingly.
*Keys 1 and 2 change the parameter, but the noise doesn't change. However, changing the same parameter in Cascade causes the noise to be either smooth or jagged.

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Won't Fix
ComponentUE - Rendering
Affects Versions4.
CreatedOct 7, 2015
ResolvedMay 1, 2017
UpdatedMay 1, 2017